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79f92663e3
your task is rescheduled to a different cpu after you've taken the lock but before calling RW_LOCK_HELD is called. We need the spinlock to ensure there is a wmb() there. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@68 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
50 lines
745 B
C
50 lines
745 B
C
#include <sys/rwlock.h>
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int
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__rw_read_held(krwlock_t *rwlp)
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{
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BUG_ON(rwlp->rw_magic != RW_MAGIC);
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if (__rw_lock_held(rwlp) && rwlp->rw_owner == NULL) {
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(__rw_read_held);
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int
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__rw_write_held(krwlock_t *rwlp)
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{
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BUG_ON(rwlp->rw_magic != RW_MAGIC);
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if (rwlp->rw_owner == current) {
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return 1;
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}
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return 0;
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}
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EXPORT_SYMBOL(__rw_write_held);
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int
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__rw_lock_held(krwlock_t *rwlp)
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{
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int rc = 0;
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BUG_ON(rwlp->rw_magic != RW_MAGIC);
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spin_lock_irq(&(rwlp->rw_sem.wait_lock));
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#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
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if (rwlp->rw_sem.activity != 0) {
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#else
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if (rwlp->rw_sem.count != 0) {
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#endif
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rc = 1;
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}
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spin_unlock_irq(&(rwlp->rw_sem.wait_lock));
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return rc;
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}
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EXPORT_SYMBOL(__rw_lock_held);
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